Method of reenforcing corrugated cardboard



June 20, 1933. w. J. COOK METHOD OF REENFORCING CORRUGATED CARDBOARD Filed April 16, 1931 7 M k 7 4 5 4 m 2 6 i 4 w 6 H5 n W my! F 6 (3 7 J 1 5/ CW/ 1/ -l A 4 L M June 20, 1933. w. J. COOK METHOD OF REENFORCING CORRUGATED CARDBOARD Filed April 16, 1951 2 Sheets-Sheet 2 Patented June 20, 1933 UNITED STATES WILLIAM JARVIS COOK, OF CLEM'JIONS; NORTH CAROLINA METHOD OF REENFORCING CORRUGATED CARDBOARD Application filed April 16, 1931. Serial No. 530,676.

This invention relates to packing cases and more particularly to an improved mode of reenforcing packing cases of the corrugated paper board type.

An object of the invention is to provide an improved corrugated type p'aper carton with reenforcements so arranged as to greatly increase its strength and durability and permit the handling of more weighty 1 objects with safety.

The invention consists in the novel construction, arrangement and combinations of parts as well as the improved method herein more particularly described and claimed.

Two sheets of drawings accompany this specification as part thereof, in which like reference characters indicate like parts throughout.

Figure 1 is a plan view of the improved carton blank unfolded with the reenforeement members in position.

Figure 2 is a perspective view ofthe carton after the initial folding operation.

Figure 3 is a perspective view; of the improved carton with the folding operation carried one step further.

Figure 4 is a perspective view of the carton with one end sealed.

Figure 5 is an exploded perspective illustrating the arrangement of the reenforcement members as theywould appear in the completely folded carton.

Figure 6 is a fragmentary longitudinal cross section view on a large scale illustratmg the position of the reenforcement members in the body of the carton.

Figure 7 is an enlarged fragmentary transverse cross section taken on line 7-7 of Figure 6.

In accordance with the present invention, the carton blank is of a generally rectangular shape with the corrugations extending transversely of its long axis. Numeral 1 identifies the carton blank as an entirety,

which carton is divided transversely by three crease lines 5 and longitudinally by two crease lines also identified by numeral 5.

Slots 4 are provided in continuation of the so transverse crease lines dividing side wall members 2 and front and back ,wall members 3.-

The reenforcement members which are preferably of wire, are arranged in groups ad acent to and on each side of the transverse fold lines and adjacent each of the ends of the carton. These reenforcement wires 6 are preferably threaded through the corrugations of the corrugated part 9 disposed between the face sheets 8-8 of the carton board as is well illustrated in Figures 6 and 7.

\Vith the structure thus defined, it will be apparent that when the carton is folded along the transverse fold lines 5, as illustrated in Figure 2, the reenforcement members will be arranged in groups closely adjacent each of the corners of the carton. \Vhen the ends are folded (in as illustrated in Figures 3 and 4, the reenforcement wires will be crossed adjacent the corners of the carton, thus providing maximum reenforcement and strength at these, the most vulnerable points of the package. In large cartons, if desired, additional reenforcement members 7 may be inserted intermediate the larger side panels as illustrated.

Obviously, each group of reenforcement members can consist of any desired number of reenforcement wires, as will be dictated by the particular weight of the object to be packed and various modifications of the arrangement will suggest themselves to those skilled in the art withinthe scope of the 5 present invention.

The invention particularly lends itself to a very simple method of application as the reenforcement wires can be readily threaded through the corrugations of standard box cartons where desired.

The wires or some of them are preferably sufficiently long to project at each end beyond the box board and these opposed ends 9; may be twisted together as at 10, which will materially strengthen the cart-on. here the contents of the box are of particular value, a seal 11 may be used in connection with such interlocked wires.

Having thus fully described'my invention, I claim:

1. A carton blank adapted to be folded on transverse lines to form side walls and on longitudinal lines to form top and bottom parts in which the blank is formed of corrugated board with the corrugations extendin transversely of the blank with a plura ity of reenforcement members positioned in said corrugations adjacent to, on each side of, and spaced from, each of the transverse folding lines and each end edge.

2. The method of reenforcing corrugated paper cartons which consists in threading wires through the corrugations vparallel with, adjacent to, and on each side of, the fold lines.

3. The structure of claim 1 in which the reenforcement members are wires greater in length than the carton blank so that the opposed ends of said wines will project beyond the edges of the carton blank.

In testimony whereof Iaflix my signature.

WILLIAM JARVIS COOK. 

